SpaceFibre Port IP Core

Transcription

1 The most important thing we build is trust ADVANCED ELECTRONIC SOLUTIONS AVIATION SERVICES COMMUNICATIONS AND CONNECTIVITY MISSION SYSTEMS IP Core TEC-ED & TEC-SW Final Presentation Days 6 7. December 2016 Technical Officer: Dirk Thurnes (TEC-EDP) Presenter: Felix Siegle Commercial in Confidence

2 Cobham Gaisler AB Official name since 10 December 2014 Founded in 2001 Located in Gothenburg, Sweden Fully owned subsidiary of Management team with 60 years combined experience in the space sector: Sandi Habinc: General Manager Per Danielsson: Senior Advisor Jan Andersson: Director of Engineering 24 employees with expertise within microelectronics and software design Complete design facilities in-house for ASIC and FPGA development 63.8 MSEK or 8.8 M$ turnover

3 Programme of work The activity was planned as a 14 months activity with the following milestones: Task 1: Preliminary SpaceFibre delivery (+2 months) Task 2: Final SpaceFibre delivery (+12 months) Due to preliminary internal work, Cobham Gaisler was able to already provide a fully verified prototype implementation as a result of Task 1, which at that time was implemented according to draft version H1 of the specification. During Task 2, the implementation and verification environment was continuously updated to reflect the updates of the specification, with the final delivery being in sync with the latest draft version H7 v3. 2

4 Deliverables Datasheet and User s Manual (D1 and D2) Verification and Validation Report (D3) Final Report (FR) VHDL Sources & Testbench (MOD1) including: Source files Testbench Macro files for ModelSim/QuestaSim and Riviera-PRO Simulation Log File Code Coverage Reports Synthesis and Place & Route Estimates 3

5 Introduction: SpaceFibre A powerful enhancement of SpaceWire EOP LA 8-bit interface SpaceWire Codec LVDS FCT LVDS SpaceWire Codec 8-bit interface Data is interrupted (EEP added) 32-bit interface Virtual Channel Retry Buffer Virtual Channel 32-bit interface 32-bit interface 32-bit interface Virtual Channel Virtual Channel Medium Access Controller SerDes FCT VC1 Frame VC3 ACK Frame VC1 NACK Frames are re-transmitted! SerDes Virtual Channel Virtual Channel 32-bit interface 32-bit interface 32-bit interface Virtual Channel Virtual Channel 32-bit interface 4

6 Introduction Implemented, verified and validated according to latest specification H7 v3. Single-lane implementation optimized for speed. Highly configurable, yet easy to use IP core. Integration into existing SpaceWire designs, e.g. routing switches, is straight-forward. 5

7 Configurability Virtual Channels The number of virtual channels The depth of the receive buffers. The depth of the transmit buffers. Width of the data bandwidth credit counter. Bandwidth idle time limit in clock cycles. Broadcast Channel Width of the broadcast bandwidth credit counter. Minimum bandwidth credit threshold limit. Error Recovery Depth of the data error recovery buffer. Depth of the FCT error recovery buffer. Depth of the broadcast error recovery buffer. SerDes Interface With internal 8B/10B coding: 20-bit or 40-bit interface, without internal 8B/10B coding: 18-bit or 36-bit interface. Enable/disable internal 8B/10B coding. Use a separate transmission clock: This feature is mandatory if the 18-/20-bit SerDes interface is used and optional in case of the 36-/40-bit interface. Technology Use asynchronous or synchronous reset. Generic memory description, which infers correct memories on RTG4 and Virtex-5. Can easily be replaced by technologydependent memories. 6

8 Verification (1/4) Testbench setup comprises a SpaceFibre port with four virtual channels. Verified according to guidelines of the European Space Agency (ESA). 7

9 Verification (2/4) The testbench executes 45 tests, including tests covering all aspects of: the lane layer the virtual channel data communication and flow control the virtual channel QoS mechanisms (bandwidth allocation, priorities, timeslots, babbling idiot protection) the reception and transmission of broadcasts the correct behaviour of the error-recovery mechanisms and the data scrambler and de-scrambler. Comes with a convenient macro file to compile and run tests: SpaceFibre port IP core testbench (c) Cobham Gaisler Possible commands: (c) Compile all files (cc) Code coverage test runs (lt) List all test cases (cp) Configure SpaceFibre port (ra) Run all tests (ri) Run individual test (cd) Clean directory (q) Quit

10 Verification (3/4) The link analyser output is written to a log file during loopback test runs: ps 0000 C5_72_31_DA ps E_93_D7_A ps ACK 0001 SEQ: 10 CRC: ps _A4_AF_DC ps _72_F0_E ps _38_D5_ ps SDF 0001 VC: ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_ ps _00_00_0A ps _00_00_0B ps _00_00_0C ps FCT 0001 SEQ: 11 CRC: 3E CH: ps _00_00_0D ps FCT 0001 SEQ: 12 CRC: 21 CH: ps _00_00_0E ps FCT 0001 SEQ: 13 CRC: 07 CH: ps _00_00_0F ps FCT 0001 SEQ: 14 CRC: 1F CH: ps _00_00_ ps FCT 0001 SEQ: 15 CRC: 39 CH: ps _00_00_11 9

11 Verification (4/4) Full code coverage can be achieved by regression testing using different hard configuration options: File Statements Branches Condition Terms async_fifo.vhd 40/40 12/12 2/2 bc_layer.vhd 30/30 20/20 - fwft_fifo.vhd 25/25 17/17 4/4 fwft_fifo_ack.vhd 27/27 20/20 2/2 if_layer.vhd 166/166 80/80 26/26 lane_layer.vhd 224/224 85/85 40/40 lreset_sm.vhd 24/24 13/13 4/4 retry_buf.vhd 132/132 62/62 8/8 retry_layer.vhd 494/ / /104 spfi_pkg.vhd 217/217 4/4 - spfi_top.vhd 54/ sync_dpram.vhd 6/6 9/9 - vc_layer.vhd 222/222 79/79 28/28 10

12 Validation: Overview Validation performed on Xilinx Virtex-5 FX130T and Microsemi RTG4. Configuration: 4 Virtual Channels. Additional components: 4 Data Generators / Sinks. 1 Broadcast Generator / Sink. Link Analyser. Comfortable control of validation test bench through GRMON / Graphical User Interface. 11

13 Validation: Test Software (1/3) Overview of all IP core status flags. Control flags: Start / Autostart / Internal Loopback. Scrambler enabled. Expected bandwidth of broadcast channel (1% to 95%). Expected bandwidth of virtual channels (1% to 95%). Priority level of virtual channels (0 to 15). Time-Slot vectors of virtual channels (64 bits). Triggering of system reset / link reset. Connection to GRMON via TCP connection. 12

14 Validation: Test Software (2/3) Data Tests (4x): Up to 4 SpaceWire addresses. Packet Length. Number of packets. Auto-repeat function. Indication of: Number of RX/TX packets. Sequence, EOP and EEP errors. Average throughput rate. Broadcast Test: Number of broadcasts. Transmission delay between broadcasts. Broadcast channel. Auto-repeat function. Indication of: Number of RX/TX packets. Number of BCs with Late flag set. Sequence and Payload errors. Average throughput rate. 13

15 Validation: Test Software (3/3) Comfortable analysis of link traffic. Sample position can freely be chosen. Raw data is decoded, e.g. virtual channel numbers and sequence numbers. Simple export of results to text file. Triggering on the following events: Data/Broadcast Payload RXERR, SKIP, IDLE, STANDBY, LOS words INIT1, INIT2, INIT3 words ACK, NACK words FULL, RETRY words SDF / EDF words SBF / EBF words FCT words, SIF words 14

16 Validation: Test Hardware Interoperability test between Gaisler s SpaceFibre IP (on Virtex-5) and STAR-Dundee s STAR-Fire unit Loopback tests on Microsemi s new RTG4 device 15

17 Validation: Test Results - Loopback SpaceFibre core is operated in external loopback mode (near-end PMA loopback of SerDes activated). 1 Link initialization handshake test (link start and auto start mode) Passed 2 Transmission and reception of data frames Passed 3 Data frames interrupted by link resets are resent correctly Passed 4 Transmission and reception of broadcast frames Passed 5 Broadcast frames interrupted by link resets are resent correctly Passed 6 Scrambled data frames transmitted/received correctly Passed 7 Broadcast transmission do not exceed maximum allowed bandwidth value Passed 8 Priority mechanism for virtual channels works as expected Passed 9 Timeslot mechanism for virtual channels works as expected Passed 10 Bandwidth limitation of virtual channels works as expected Passed 11 Internal loopback mode works as expected Passed 16

18 Validation: Test Results - Device Interoperability SpaceFibre core is connected to STAR Fire unit via Serial ATA cables. Data is sent/transmitted on virtual channels 0 and 1 and looped back through routing switch in STAR Fire unit. Data Test 0 Data Test 1 Broadcast Test STAR-Dundee STAR Fire Device Link initialization handshake Data frames are sent and received correctly Broadcast frames are transmitted correctly (manual check) Broadcast frames are received correctly (manual check) Passed Passed Passed Passed Virtual Channels Broadcasts Cobham Gaisler SerDes Interface Link Analyser Virtex-5 Rocket IO GTX Transceiver VC0 Router STAR-Dundee SpaceFibre Port #2 VC1 Data frames interrupted by link resets are resent correctly Passed Broadcast frames interrupted by link resets are resent correctly Passed Scrambled data frames are sent and received correctly Failed 17

19 Synthesis Estimates Technology Configuration Area Expected data rate C65SPACE Full config with 8 VCs 25,971 NAND gate equivalents > 6.25 Gbps Virtex-4QV SX55 No 8b10b with 4 VCs 3% FFs, 9% LUTs, 3% RAMs > Gbps Virtex-5Q FX130T No 8b10b with 4 VCs 2% FFs, 4% LUTs, 3% RAMs 6.25 Gbps RTG4 Full config with 4 VCs 2% FFs, 4% LUTs, 4% RAMs Gbps RTAX2000s Full config with 2 VCs 27% C-Cells, 19% S-Cells, 37% RAMs Gbps 18

20 Thank you for your attention 19

21 Video Demonstration: Virtual Channel Bandwidth Allocation 20

22 Video Demonstration: Virtual Channel Different Priorities 21

23 Video Demonstration: Virtual Channel Timeslots 22

24 Video Demonstration: Virtual Channel Broadcasts 23

25 Video Demonstration: Virtual Channel Link errors 24